Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 11h Subfunction 03h
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  Interrupt:   10h     Function:   11h     Subfunction:   03h
 
  Title:       Set Block Specifier
 
  Description:                                        [EGA] [MCGA] [VGA]
 
     Determines the character blocks selected by bit 3 of character
     attribute bytes in alphanumeric (text) display modes.
 
     Input                              Output
 
     AH = 11h                           None
     AL = 03h
     BL = Character generator block
          select code
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